Improvement in keys for locks



J. SCHADE.

KEYS FOR LOCKS.

No. 189,503. Patented April 10, 1877.

If 4 F? i WITNESSES. INVEJVTO R %,f B his Attorneys-10%. Ya-finale,

N,PETER3. PNOYO-LITHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT QFFICEc JOHN SCHADE, OF STAMFORD, CONNECTICUT,ASSIGNOR TO THE YALE LOCK MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT IN KEYS FOR LOCKS.

Specification forming part of Letters Patent No. 189,503, dated April10, 1877; application filed March 13, 1877.

To all whom it may concern Be it known that 1, JOHN SGHADE, of Stamford,in the county of Fairfield and State of Connecticut, have inventedcertain Improvements in the Manufacture of Keys, of which the followingis a specification that will enable persons skilled in the art to makeand use the same, reference being had to the accompanying drawings.

My improvements relate to composite keys of that class in which the bowand-shank are stamped from one piece of sheet metal, and afterwardsecured to the stem or spindle which carries the bit; and they consistin an improved construction of such a key, as hereinafter specificallyset forth and claimed.

In the drawings, Figure ,1 is a perspective view of-my key complete.Fig. 2 is a view of the bow and stem united. Fig. 3 is a longitudinalsection through the stem, showing the mode of uniting it to the shank.Fig. 4 is an end view of the stem bored and slotted to re ceive the bit.Fig. 5 is a view of the bit detached.

In the manufacture of my key, I first stamp out the bow and shank from asingle piece of sheet-steel. I then bore one or more holes through thesmall end, place it in a suitable mold, and cast upon it a cylindricalstem, usually of brass. The molten metal surrounds and enters the holesin the ends of the shanks, and when cooled the shank and stem becomepractically riveted very securely together, as shown in the sectionalView, Fig. 3. Instead of boring holes, notches might beformed in theshank to receive the cast metal. The next step is to borea holelongitudinally in the end of the stem, and saw open one side of it,forming a slotted recess for the reception of the bit, as indicated inFig. 4. The bit, Fig. 5, made from rolled or drawn stock, is theninserted and secured in the stem, and the key finished in the usual Way.

I do not claim the tenon on the end of the shank shown in Fig. 3 as myinvention, nor the recess in the end of the tenon.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. A composite key formed of a sheet-metal shank and how, a cast-metalstem, and a bit secured in a slotted recess in the stem, substantiallyas described.

2. The combination of a sheet-metal key shank and bow, unprovided with abit, and a solid cast-metal stem, unprovided with a bit, substantiallyas and for the purpose described.

3. The process of forming a key, substantially as described, consistingin stamping out the bow and shank, casting the stem upon it, and thenforming a slotted recess in the stem, and securing the bit within it.

In testimony whereof I have hereunto subscribed my name. JOHN SCHADE.

Witnesses:

WALTER FULLER, E. D. OGDEN, Jr.

